David Michard:
> Hello,
>
> I know this question has been discussed on this list* but no suitable
> solution was provided for our SMTP server settings.
> A patch** is published but reports on this list say that it does not work.
>
> I am responsible for a medium sized mailing-list, through which one
> email is sent per day to roughly 600 000 subscribers. Since our
> mailing list is growing, we are having more and more problems with
> very conservative SMTP servers enforcing a low number of simultaneous
> connections from a single IP address. Our subscribers wish to receive
> their email as soon as possible so delaying the email for a few hours
> is not an option.
You need to cut deals with ISPs and other sites that you have lots
of customers at. Using a "spread spectrum" approach is just a trick
to fly under the radar, and that works only with low-volume mail.
> Is it possible to tell postfix to randomly select an IP address, and
> associated hostname (as many smtp servers perform RDNS lookups and
> compare it to the HELO/EHLO greeting) when sending an email ?
> That would be very helpful.
You would use a regexp-based transport map that matches the first
character(s) of the recipient email address, and that routes mail
to a Postfix mail delivery agent that has its own smtp_bind_address
etc. setting in the master.cf file. However, the concurrencies for
each delivery agent are scheduled independently, as if you are
running multiple Postfix instances.
Wietse
> Regards,
> David.
>
> (*) http://www.mail-archive.com/postfix-users@postfix.org/msg18400.html
> & http://www.mailinglistarchive.com/postfix-users@postfix.org/msg57399.html
> (**) http://denixsolutions.com/Scripts/Postfix-Multiple-Interfaces-Patch
> (***) At this stage I feel it is necessary to stress that the
> mailing-list is not for profit and that we take every step to make
> sure that subscribers who change their mind are unsubscribed as soon
> as possible. We use confirmed opt-in (aka "double opt-in") for
> subscription, simplified unsubscription, every RFC compliant headers
> required for bulk emailing, VERP, SPF, DKIM, complaint feedback loop
> with ARF with most providers etc in order to maintain a high
> deliverability ratio. I am not willing to give the name of the
> organisation so you will have to take my word for it.
>
>
